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Stock-Based Compensation (Schedule of Share Option Activity) (Details) - Stock Options [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Number of Options Outstanding
Options outstanding at December 31, 2020	602,683
Granted	73,669	0
Exercised	0	0
Options outstanding at March 31, 2021	676,352		602,683
Unvested	564,622
Vested and exercisable	111,730
Weighted Average Exercise Price Per Share
Options outstanding at December 31, 2020	$ 11.01
Granted	6.45
Options outstanding at March 31, 2021	10.51		$ 11.01
Unvested	4.78
Vested and exercisable	$ 39.47
Weighted Average Remaining Contractual Term (Years)
Options outstanding	9 years 2 months 19 days		9 years 4 months 21 days
Unvested	9 years 7 months 6 days
Vested and exercisable	7 years 3 months 18 days
Aggregate Intrinsic Value
Options Outstanding at December 31, 2020	$ 1,861
Unvested	1,458
Vested and exercisable	95
Options Outstanding at March 31, 2021	$ 1,553		$ 1,861

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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